Meaning
Swollen — puffed up from injury, illness, an insect bite, or infection. 'Mi foot swell up' means my leg/foot is swollen. As a verb, to 'swell up' is to become swollen. It can also describe a face 'swell up' with sulking or crying, and a person 'swell up' with anger or pride.
Examples
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Mi foot swell up after di bee sting.
My foot swelled up after the bee sting.
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Him face swell up cause him a sulk.
His face is puffed up because he's sulking.
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Di bruise swell up big.
The bruise swelled up big.
Origin
From 'swell' + 'up'; swollen/to become swollen. See [[water-belly]], [[bruise]].
How it’s used
Swollen (injury/illness); also a face 'swell up' with sulking. See [[water-belly]], [[gum-boil]].